Loudoun County, VA Building Permit Fees (2026)
Actual residential building permit fee formula from the official Loudoun County Building and Development fee schedule. Verified against published county documents.
This page covers: The residential building permit fee in Loudoun County, including the bundled flat fee for smaller projects and the 1%-based formula for larger ones. All examples include Virginia's mandatory 2% USBC state levy.
This page does NOT cover: Trade permits (electrical, plumbing, mechanical), development impact fees, zoning review fees beyond what is bundled in the building permit fee, reinspection fees, revision fees, or commercial permits. Trade permits are issued separately with their own fee schedules.
Note on fee bundling: Loudoun County's fee schedule bundles the building permit fee, plan review fee, and county zoning permit into a single flat fee for residential additions and alterations under 1,000 sq ft. The USBC state levy is applied to the full bundled amount as an estimate - the exact levy calculation on the zoning portion is not separately broken out in the published schedule.
For most residential deck and small addition permits in Loudoun County, the fee is a flat $395 - this bundled fee covers the building permit, plan review, and county zoning permit together. Adding Virginia's mandatory 2% USBC state levy brings the estimated all-in total to $402.90. Larger additions over 1,000 sq ft are charged at 1% of construction value plus a $335 plan review fee.
- Residential additions and alterations under 1,000 sq ft cost a flat $395, which bundles the building permit, plan review, and county zoning permit.
- Projects over 1,000 sq ft are charged 1% of construction value plus a $335 plan review fee - the county zoning permit is additional.
- All Loudoun County building permits are subject to Virginia's mandatory 2% USBC state levy on top of the permit fee.
- Trade permits (electrical, plumbing, HVAC) are not included - each requires a separate permit and fee.
- The current published fee schedule is effective July 1, 2022. Verify current rates with the county before filing.
Loudoun County Building Permit Fee Formula
Loudoun County uses a hybrid fee structure: a single bundled flat fee for smaller projects, and a percentage-based formula for larger ones. Virginia's 2% USBC state levy applies to all permits.
| Project Size | Base Permit Fee | Plan Review | County Zoning Permit | USBC State Levy |
|---|---|---|---|---|
| Additions & alterations ≤ 1,000 sq ft |
$395.00 flat (building permit + plan review + zoning permit - bundled) | 2% × $395 = $7.90 | ||
| Additions > 1,000 sq ft |
1% of construction value | $335.00 | Separate - verify with county | 2% × (permit + review) |
| Alterations (any size) |
1% of construction value | $130.00 | Not listed separately | 2% × (permit + review) |
| Minimum fee | $65.00 | |||
Source: Loudoun County Department of Building and Development, Building and Development Application Fee Schedule. Fee schedule effective July 1, 2022 - most recent version published as of April 2026. Verify current rates before filing.
How Loudoun County Calculates Building Permit Fees
| Step | What Happens | Loudoun County Rule |
|---|---|---|
| 1. Classify the project | Determine if it is an addition, alteration, or new construction. Determine square footage. | Additions ≤1,000 sq ft use flat fee. Additions >1,000 sq ft and alterations use percentage. |
| 2. Calculate base fee | Apply flat fee or 1% of declared construction value, whichever applies. $65 minimum. | Flat $395 (≤1,000 sq ft) or 1% of construction value (>1,000 sq ft / alterations) |
| 3. Add plan review | For projects using the percentage formula, plan review is charged separately. | $335 for large additions; $130 for alterations. Included in flat $395 for small projects. |
| 4. Apply USBC state levy | Virginia's mandatory 2% levy is added to the combined permit and plan review fees. | 2% × (permit fee + plan review fee). For flat-fee projects: 2% × $395 = $7.90. |
| 5. County zoning permit | Some projects require a county zoning permit in addition to the building permit. | Included in flat $395 for small additions. Separate fee for large additions - verify with county. |
Worked Examples
Example 1: $15,000 Deck (estimated 400 sq ft - under 1,000 sq ft threshold)
| Fee Component | Rule Applied | Amount |
|---|---|---|
| Building permit + plan review + zoning permit (bundled) | Flat fee for additions ≤1,000 sq ft | $395.00 |
| USBC State Levy | $395 × 2% | $7.90 |
| Estimated Total | $395 + $7.90 | $402.90 |
Assumptions: Deck classified as a residential addition under 1,000 sq ft. Flat bundled fee applies. USBC levy applied to full $395 (zoning permit portion not separately broken out in published schedule - levy estimate is conservative). No trade permits included. Reinspection and revision fees not included. Source: Loudoun County fee schedule effective July 1, 2022.
Example 2: $40,000 Room Addition (estimated 1,200 sq ft - over 1,000 sq ft threshold)
| Fee Component | Rule Applied | Amount |
|---|---|---|
| Base Permit Fee | $40,000 × 1% | $400.00 |
| Plan Review Fee | Flat fee for large additions | $335.00 |
| County Zoning Permit | Separate - not in published schedule | Verify with county |
| Subtotal (permit + plan review) | $400 + $335 | $735.00 |
| USBC State Levy | $735 × 2% | $14.70 |
| Subtotal (excl. zoning permit) | $735 + $14.70 | $749.70 + zoning |
Assumptions: Addition exceeds 1,000 sq ft - percentage formula applies. Construction value declared as $40,000. County zoning permit fee is listed as a separate charge for large additions but the amount is not published in the fee schedule accessed - verify with Loudoun County Building and Development before budgeting. Trade permits not included. Source: Loudoun County fee schedule effective July 1, 2022.
Practitioner Insight
Loudoun County's flat $395 fee for small residential additions is structurally different from Fairfax County's percentage-based model - and notably cheaper for typical deck and shed projects. A $15,000 deck in Fairfax County costs $688.50 all-in; the same project in Loudoun runs approximately $402.90. That $285 difference is real money, and it reflects Loudoun's policy of bundling multiple fee components into a single flat charge for smaller jobs.
The practical complication is that the flat fee bundles the county zoning permit along with the building permit and plan review. For projects that require additional zoning approvals - a deck that triggers a setback variance, for instance, or an addition in a planned development overlay - the zoning portion may involve separate review steps not covered by the $395 base fee. Confirm with the Building and Development office whether your specific project triggers any zoning review outside the standard bundled fee.
Permit Requirements - Common Residential Projects in Loudoun County
| Project Type | Permit Required? | Typical Fee Category | Notes |
|---|---|---|---|
| Deck (attached, under 1,000 sq ft) | Yes | $395 flat + $7.90 levy = $402.90 | Classified as residential addition |
| Deck (attached, over 1,000 sq ft) | Yes | 1% + $335 plan review + levy + zoning | Large decks uncommon; verify square footage |
| Room addition | Yes | $395 flat (≤1,000 sq ft) or 1% formula | Trade permits required separately |
| Shed / accessory structure | Yes - if over exemption threshold | $395 flat or 1% formula | Verify sq ft threshold with county |
| In-ground swimming pool | Yes | 1% of construction value + fees | Fence/barrier permit also required |
| Fence | Varies by height/type | Verify with county | Zoning clearance may be required |
| Roof replacement | Yes in Loudoun County | Alteration fee: 1% + $130 plan review | Classified as alteration |
| Kitchen/bathroom remodel (structural) | Yes | Alteration: 1% + $130 plan review | Trade permits required separately |
| Electrical work | Separate electrical permit | Trade permit - separate fee | Not covered by building permit fee |
| HVAC replacement | Separate mechanical permit | Trade permit - separate fee | Not covered by building permit fee |
Permit trigger thresholds and classifications are set by Loudoun County and the Virginia Uniform Statewide Building Code. When uncertain whether a permit is required for your project, contact Loudoun County Building and Development at 703-777-0220 before starting work.
Loudoun County Building Permit Office
Department of Building and Development
Loudoun County Government
703-777-0220
Building and Development main line
1 Harrison St. SE
Leesburg, VA 20175
LandMARC
Apply and pay online at loudoun.gov/bdapplyonline
When This Estimate May Not Apply
County zoning permit fee not specified
For additions over 1,000 sq ft, the county zoning permit is listed as a separate charge but its amount is not published in the accessible fee schedule. Budget for this additional fee and confirm the amount with the county before filing.
Fee schedule may have been updated since July 2022
The July 1, 2022 fee schedule is the most recent publicly posted version found as of April 2026. Loudoun County may have adopted fee changes not yet posted online. Confirm the current rates before filing or budgeting your project.
Projects requiring a zoning variance or special exception
If your project requires a Board of Zoning Appeals variance, special use permit, or zoning amendment, additional planning and zoning fees apply separately from the building permit fee. These can significantly exceed the building permit cost.
After-the-fact permits (work without permit)
Permits pulled after unpermitted work is discovered typically carry a penalty multiplier. The standard fee schedule does not include this penalty. Resolve unpermitted work through the county - do not assume standard fees apply.
Commercial or mixed-use construction
This page covers residential permits only. Commercial building permits in Loudoun County use a different fee table and typically require additional plan review. Do not apply these rates to commercial projects.
Frequently Asked Questions
Sources
-
Loudoun County - Residential Additions and Alterations (Building and Development) Current · Loudoun County, VA · Source of $395 flat fee and 1% formula for residential additions and alterations · Verified April 11, 2026 Verified
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Loudoun County - Building and Development Fee Schedules Fee Schedule effective July 1, 2022 · Loudoun County Department of Building and Development · Most recent version published as of April 2026
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Code of Virginia §36-139 - USBC State Levy Authority Current · Virginia General Assembly · Authorizing statute for the statewide 2% building permit levy
Compare Loudoun County fees against Fairfax County, or calculate your project cost.
Permit Fees Are One Part of Your Project Budget
Once you know your Loudoun County permit cost, two related numbers round out your total budget picture:
Property tax impact after your project closes
A permitted deck or addition increases your assessed value in Loudoun County. See how each Virginia jurisdiction calculates the ongoing property tax impact at CountyTaxTools.com.
Zoning review and impact fees for larger projects
Development impact fees and zoning costs in Loudoun County can exceed the building permit fee for major additions and new construction. Research them at ZoneFee.com.